[CSS] CSS Image Sprites 一張(長)圖做成動畫或不同按鈕

https://www.w3schools.com/css/css_image_sprites.asp
https://codepen.io/Piiter/pen/pQQvqe?editors=0110

[JS] 各種寬度/高度的存取、標籤Token search

Use screen measurements to design for responsive breakpoints

Tokenfield for Bootstrap

[JS/CSS] 網頁載入進度條，純前端做法。分子鏈效果 particles.js。很多函式庫

Accurate Page Loading Progress Bar codepen Ahsan K. Rathore

https://github.com/VincentGarreau/particles.js/

https://www.jianshu.com/p/c830b262c56d 很多效果，原文出處 https://hackernoon.com/67-useful-tools-libraries-and-resources-for-saving-your-time-as-a-web-developer-7d3fb8667030